This paper undertakes a critical and constructive investigation into the applicability of value sensitive design (VSD) and design for values (DfV) methodologies for urban technologies, as a means to envision and enact responsible urban innovations. In particular, this paper focuses on the identification and analysis of values in urban technologies. First, an important methodological critique is highlighted, namely the vague articulation of 'values' in VSD and DfV discourse. Next, cities are characterized as open, dynamic, and evolving systems, with 'urban technologies' as co-shapers of this process. This highlights the unique conditions requiring attention in order to arrive at a robust understanding of the relationship between values and urban technologies. Finally, these insights are combined to propose and sketch six heuristic principles aimed at surfacing and analysing values in urban technologies, offering a refinement of value-sensitive methodologies for the context of urban technological innovation.